The HEKSetup_1.00.exe file you have requested: Tools and Utilities / Halo Editing Kit 1.00 - 264.3mb is not available. Perhaps try browsing all files for the game Halo: Combat Evolved and upload any files you want to share or are missing. This is the only information we could locate:

Halo editing kit, allows you to create your own levels for the game (for use with HaloCE).

We recommend you return to the download list and browse the links from there. If the problem persists, contact us with the details.